Safety-envelop.



I. KLEIN.

SAFETY ENVELOP.

APPLICATION FILED NOV. 13, 1906.

902,301. Patented 0@t.'27,190s.

INVENTOH W/T/VES8ES..' 'J/w oxw. dor Klein, By

UNIT STATES PATENT OF IQIDORE KLEIN, on NEW YoaK, a. v

S FETY-savages.

110. 90.2301. Specification of Letters Patent. Patented Oct. 27, 1908.Application filed November 13, 1906. SerialNo. 343,194.

To all whom it may concern: simply the margin 4', but I deem it prefer-Be it known that I,"Isn)onn KLEIN,'a citi able to save the weight inthis Way and to zen of the United States, residing at New have theguinmed margin 4" correspond in York city, in the county of New York andshape with the margin of the flap 3. Inso State of New York, haveinvented certain stead othaving the rear flap gummed as at new anduseful Improvements in Safety-En- 4 the upper flap 3 might be gummedalong velops, of which the followlng IS a specificaits inner margin withexactly 'the same effect tion. and I wish it understood that I regardsuch My invention relates to envelops and more a transposition-of thegum as entirely equ1v- 65 particularly to envelops which cannot be alentto the'use of the gum on the rear flap opened without damage andresultant detecand as entirely within my invention. The tlon. margin ofthis flap 4 is gummed .on its out- The invention consists in a certainform side face as at 4" for the attachment of the of blank, and anarrangement of sealing margin ofthe upper flap 3. The end llaps 7o flapssuch as will be later described, and its 5 and 6 are substantially ofthe same form object is to provide an envelop whose flaps as the usualend flaps of envelope except that when sealed cannot be opened by theuse of along their upper edges they are bent backsteam or the insertionof a knife blade or wardly to form the auxiliary flaps '5' (3. otherinstrument beneath them without so Th e'innor surface of the flaps 5 and6 has badly daniaging. the envelop that the unaugum or other adhesiveplaced along the marthorized breaking of the inrlosl'u'e is plainlygills as at 5 6" (i By linkof evident. l I these gumnied margins theflaps are pasted I have shown my invention in'the accomdown upon theback flap 4 in the position as I panying drawing, wherein shown in Fig.2. It wil1 be seen that the so Figure 1 is a rear view of the envelopend of'flap at 6 projects'up under the sealed. Fig. 2 is a rear view ofthe envelop extreme end of the flap?) and' is protected unsealed. Fig. 3is a rear view showing the thereby. I

envelop with one of the flaps opened out to In sealing the envelop, theflap 3isbrought" show certain details thereof. Fig.- 4:1is a down and'bymeans of the gum 4" its margin 85 plan of the blank from which theenvelop is attached to the back flap 4. Then the is to be made. folds orauxiliary flaps 5" 6" are moistened Like numerals throughout all thefigures and folded over on to the outer face of'the indicate like parts.marginof flap 3 as shown in Fig. 1 It will 2 designates that portion ofthe blank now be seen that counting from the bottom so which forms thefront of the envelop; there are three gummed faces tb be attacked is theupper flap, which is usually used before any opening can be made intothe r, in enve'lops. I envelop by attempting to raise the flaps 5 4 isthe lower flap, and 5 and 6 are the two and that the flap 3 is not onlyhelddown by side flaps. The lower flap 4: instead of being the gummedmargin 4:",but that it 1s pro- 90 pointed a d extending to the middle ofthe tected by the auxiliary flaps 5 6. It 1s also envelop when folded,is of suflicient deptli'at to be noticed that were the flaps 5 6 to beits side edges to extend up to the fold of the raised the edge of thetop flap would be top flap 3. A triangular shaped portion protectedbythe edges of the side flaps 5 may be out out in its center with edges 4'and'G t0 the extent of not allowing a knife 100 which, when the flap isfolded extend downblade to be inserted under the edge of the wardparallel with the upper edges of the flap 3, or preventing the insertion'of any 4 side flaps 5 and 6. The edge 4: is not in round instrument, aspencil or pen holder,

alinenient with the edges of the side flaps, as --which'byits rotationmight raise the flap a they are before sealing, but project a slightThis is a most important point as it has been 1 distance above saidflaps as shown in Figs. found in practice that the top flap 3 being. 2and 3. l on a levelwith the main portion of fiaps 5 It will be evidentthat the. rear flap may and 6 absolutely prevents the insertionsucei'tend up to the fold of flap 3 along its ences'sfully of anynstruments for opening the tire upper edge, and it is also evident thatflap 8. Aga1n',theaux1l1ary flaps o 6 pro- 9 the entire space designedto be covered by tect'the iguni attaching flap 3 to 4 and thus the flap3 might be gun-lined instead of ]\1Si3- prevent steaming the letteropen- The fact that the rear flap 4 also extends up to a dista'ncebeyond the margin of flap 3 is also of importance as an instrumentinserted under the side flaps and 6 must first open the gummed margin 5'6, is then'met by the gummed margins 5" 6 and lastly it is met by thegummed margin 4'.

Another point of va lue is the fact that the gummed margin l" of theback flap 4 extends up to the edge of the envelop and that the auxiliaryflaps 5' 6 also extend up to the extreme upper. edge of the envelop.Thus the top flap 3 is protected from the insert-ion of a knife bladenot only at its lower corner but along its whole extended margin.

' .lVith ordinary envelops it is possible to insort a pencil or otherround object along the upper edge between the sealing flap and the mainportion of the envelop and ,then by rotating the pencil or roller toopen the flap 3 without in any manner marring the envelop, or at anyrate open it sufficiently that the contents may be examined or drawnout. This is not the case with envelops made according to my inventionas it is impossible in the first place to insert any instrument betweenthe 'fiap'3 and the main portion of the envelop by raising the auxiliaryflaps and also because with the double holding surface given by themargin 4'' and the auxiliary flap there can be no lifting of the upperflap away from the gummed surface but only a tearing of the flap whichis, of

course, in'unediately shown. As an additional protection against anytampering with the envelop by lifting the side flaps 5 and 6, I providethe bottom flap 4 with two inwardly turned flaps 4" which are gummed ontheir outside faces and by th s gum are attached to the inside face ofpart 2 of the envelop, thus forming a sort of pocket of the rear flapand the front of the envelop. lVhen these auxiliary flaps 4 are used,even if the side flaps were raised, ,it would still be necessary todetach the rearflap from the front face of the envelop. It is to be alsonoted that the rear flap being covered by the side flaps 5 and 6, it isimpossible to steam open the auxiliary flaps 4, they being fullyprotected by the side flaps. The envelop is so securely sealed by reasonof these different gummed portions that as so 'fardescribed it ispractically impossible to open it without mu tilating it or without cutting off one edge.

As in many offices, a small pointed instrurxent is usedfor insertingunder the edge of the flap and cutting through it when open ing letters,itis necessary to provide means for the insertion of saidinstrument. Ido this, by cutting away the rear flap as at 4" at its junction withthegside'flaps and the face of the envelop. Through the opening thusformed at each lower corner of the envelop, an instrument may beinserted to cut through either atthe side ofthe envelop or at the bottomedge thereof.

My invention is simple and may be cheaply i made, and does not requireany wide Variation in the form of envelop machinery at present in use.It 1s thoroughly effective in operation and prevents any unauthorizedtampering with the envelopwithout detection. Having described myinvention what I claim is: i 1

1. An envelop having an upper sealing flap and side flaps, a lower flapextending upwardly beneath the side flaps and having a gummed marginprojecting beyond the upper edge of the side flaps along its entirelength adapted to engage with the margin of the sealing flap when thelatter is sealed down, said side flaps being gummed to the outer face ofthe lower flap and having free auxiliary flaps extending along the wholelength of their upper edges and directly attached to and in one piecewith the upper edges of the side rflap, said auxiliary flaps beingprovided on their undersurface with an adhesive and being adapted tocover and be attached to the outside margin of the sealing flap alongits whole length when the latter is sealed. I

2. An envelop having an upper sealing flap and side flaps, a lower flapextending upwardly beneath the side flaps projecting beyond the samealong the entire length thereof and having a gummed margin adapt ed toengage with the margin of the sealing flap along its entire length whenthe latter is scaled down, auxiliary flaps extending along the entirelengthof the side edges of the lower flap, folded inwardly and attachedto theinside face of the front of the envelop, said main side flapshaving an upper margin continuous with and abutting against the entirelength of the'lower edge of the sealing flap when the latter is sealed,and being provided with "auxiliary [laps extending the entire length ofsaid upper margin directly faces for attachment to the sealing flap 3, i

when the envelop is folded, substantially as described.

LA. blank for-envelope having the face portion 2, the sealing flap 3,the lower flap/l having the gummed margins and the auxiliary gummed sideflaps 4', and the two 1 end flaps 5 and 6 provided with the auxiliaryflaps 5 6 gunnned on their inner surfaces for attachment to. the sealingflap 3, when the envelop is folded, substantially as described. 7

In testimony whereof, I have signed my name to this specification i twosubscribing Witnesses, January 1906.

ISID

Witnesses n the presence of this 18th day of ORE KLEIN.

J. A. VERNON.

